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andesite
(redirected from Andesitic)

    Also found in: Encyclopedia, Wikipedia 0.01 sec.
an·de·site  (nd-zt)
n.
A gray, fine-grained volcanic rock, chiefly plagioclase and feldspar.
[After the Andes.]
andesite [ˈændɪˌzaɪt]
n
(Earth Sciences / Geological Science) a fine-grained tan or grey volcanic rock consisting of plagioclase feldspar, esp andesine, amphibole, and pyroxene
[from Andes + -ite1]
andesite  (nd-zt)
A gray, fine-grained volcanic rock. Andesite consists mainly of sodium-rich plagioclase and one or more mafic minerals such as biotite, hornblende, or pyroxene. It often contains small, visible crystals (phenocrysts) of plagioclase. It is the fine-grained equivalent of diorite.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.andesite - a dark grey volcanic rockandesite - a dark grey volcanic rock            
igneous rock - rock formed by the solidification of molten magma
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The geological mapping program has identified a rock sequence consisting of andesitic and dacitic volcanics intruded by microdiorite and quartz monzonitic stocks in an extensional environment typical of Nevada's Basin and Range geological province.
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